[  187.632058] BUG: unable to handle kernel NULL pointer dereference at           (null)
[  187.632117] IP: [<          (null)>]           (null)
[  187.632151] PGD 102735067 PUD 102734067 PMD 0 
[  187.632190] Oops: 0010 [#1] SMP 
[  187.632218] Modules linked in: autofs4 arc4 nls_utf8 cifs nfsv4 rfcomm bnep bluetooth snd_hda_codec_realtek rpcsec_gss_krb5 snd_hda_intel nfsd snd_hda_codec nfs_acl coretemp snd_hwdep auth_rpcgss snd_pcm i915 gpio_ich nfs snd_seq_midi fscache snd_rawmidi kvm lockd snd_seq_midi_event snd_seq drm_kms_helper snd_timer drm hid_generic snd_seq_device sunrpc lpc_ich snd psmouse i2c_algo_bit soundcore usbhid snd_page_alloc hid dell_wmi serio_raw mac_hid sparse_keymap ppdev lp video microcode dcdbas wmi parport_pc parport tg3
[  187.632629] CPU 1 
[  187.632646] Pid: 2143, comm: bash Not tainted 3.7.0-030700rc2-generic #201210220428 Dell Inc. OptiPlex 380                 /01TKCC
[  187.632713] RIP: 0010:[<0000000000000000>]  [<          (null)>]           (null)
[  187.632759] RSP: 0018:ffff880122829d00  EFLAGS: 00010246
[  187.632791] RAX: ffffffffa04a3bc0 RBX: ffff8801060c0480 RCX: 0000000000000000
[  187.632832] RDX: 0000000000000003 RSI: ffff8801060c0480 RDI: ffff8801102d50d8
[  187.632872] RBP: ffff880122829d28 R08: ffff88012bc57340 R09: ffffc90000002000
[  187.632912] R10: 0000000000000000 R11: ffff8801102d50d8 R12: ffff8801060c0780
[  187.632952] R13: ffff8801060c0780 R14: ffff880122829e98 R15: 0000000000000000
[  187.632993] FS:  00007f61f6026700(0000) GS:ffff88012bc40000(0000) knlGS:0000000000000000
[  187.633039] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  187.633072] CR2: 0000000000000000 CR3: 0000000102732000 CR4: 00000000000407e0
[  187.633112] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  187.633153] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  187.633194] Process bash (pid: 2143, threadinfo ffff880122828000, task ffff880106be0000)
[  187.633240] Stack:
[  187.633253]  ffffffff8119b55d ffff8801060c0780 ffff8801060c0780 ffff880122829e98
[  187.633306]  0000000000000003 ffff880122829d58 ffffffff8119b9c8 ffff880122829d58
[  187.633358]  01ffffff816c4c1d ffff880122829e88 ffff880122829dd8 ffff880122829d98
[  187.633410] Call Trace:
[  187.633431]  [<ffffffff8119b55d>] ? lookup_real+0x1d/0x60
[  187.633465]  [<ffffffff8119b9c8>] __lookup_hash+0x38/0x50
[  187.633499]  [<ffffffff816b25e8>] lookup_slow+0x47/0xab
[  187.633531]  [<ffffffff8119e0e6>] path_lookupat+0x236/0x7a0
[  187.633566]  [<ffffffff8117edb1>] ? kmem_cache_alloc+0x31/0x140
[  187.633602]  [<ffffffff8119cdd0>] ? getname_flags.part.23+0x30/0x150
[  187.633641]  [<ffffffff8119e684>] filename_lookup+0x34/0xc0
[  187.633675]  [<ffffffff8119cf56>] ? getname_flags+0x66/0x80
[  187.633709]  [<ffffffff811a1149>] user_path_at_empty+0x59/0xa0
[  187.633745]  [<ffffffff811968fb>] ? vfs_stat+0x1b/0x20
[  187.633776]  [<ffffffff81196a4a>] ? sys_newstat+0x1a/0x40
[  187.633810]  [<ffffffff811a11a1>] user_path_at+0x11/0x20
[  187.633843]  [<ffffffff81190943>] sys_chdir+0x23/0x90
[  187.633875]  [<ffffffff816cff59>] system_call_fastpath+0x16/0x1b
[  187.633909] Code:  Bad RIP value.
[  187.633938] RIP  [<          (null)>]           (null)
[  187.633972]  RSP <ffff880122829d00>
[  187.633994] CR2: 0000000000000000
[  187.661171] ---[ end trace 52011daad23d25b0 ]---